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Re: deprecation of in-tree builds


From: BALATON Zoltan
Subject: Re: deprecation of in-tree builds
Date: Sat, 21 Mar 2020 23:50:23 +0100 (CET)
User-agent: Alpine 2.22 (BSF 395 2020-01-19)

On Sat, 21 Mar 2020, Peter Maydell wrote:
AIUI from Paolo, the intention is to deprecate and eventually
stop supporting "in-tree" builds, so that the only option is
building in a separate build directory. I thought we should
probably mention that in the 5.0 changelog, so I wrote up some
text:

https://wiki.qemu.org/ChangeLog/5.0#Build_Information

Suggestions for changes/comments etc welcome.

(One thing we will need to fix before we can do separate build
tree is the Coverity Scan build process, which (a) does an
in-tree build (b) can't be easily switched to a builddir because
all the source paths get baked into the scan results and moving
to a builddir changes them all...)

We could also make configure actively warn if used in
the source tree.

This was discussed before. I think instead of annoying people with a warning, rather configure should be changed to create a build dir if run from source and have a Makefile in top dir that runs make -C builddir so people don't have to care about this or change their ways and can continue to run configure && make from source dir but you don't have to support in-tree build. Then you can deprecate in-tree builds but supporting only out-of-tree without this convenience would not just unnecessarily annoy those who prefer working in a single tree but people (and apparently some tools) expect sources to build with usual configure; make; make install so that should be the minimum to support.

Regards,
BALATON Zoltan



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